Gear finishing machine



Feb. 12, 1952 w. s. PRAEG GEAR FINISHING MACHINE l8 Sheets-Sheet 1 Filed April 15, 1946 INVENTOR. WALTER S. PRAEG ATTO R N EYS Feb. 12, 1952 5 PRAEG 2,585,271

GEAR FINISHING MACHINE Filed April 15, 1946 18 Sheets-Sheet 2' WALTER S. PRAEG ATIORNEYS l8 Sheets-Sheet 5 INVENTOR.

ATTORNEYS Feb. 12, 1952 w s PRAEG GEAR FINISHING MACHINE Filed April 15, 1946 1952 w. s. PRAEG GEAR FINISHING MACHINE l8 Sheets-Sheet Filed April 15, 1946 INVENTOR.

WALTER 3. PR AEG ATTORNEYS 2 w. s. PRAEG GEAR FINISHING MACHINE l8 Sheets-Sheet 5 Filed April 15, 1946 ATTORNEYS Feb. 12, 1952 w 's PRAEG 2,585,271

GEAR FINISHING MACHINE Filed April 15, 1946 18 Sheets-Sheet 6 S". N g.

.n 8 m. m JNVENTOR. I N N m N 4r N WALTER $.PRAEG ATTORNEYS 1952 w. s. PRAEG GEAR FINISHING MACHINE l8 Sheets-Sheet 7 Filed April 15, 1946 R m m m A V R m s R E w. A w

Y B HI mw I v u E Q knk ATTORNEYS Feb. 12, 1952 w s PRAEG 2585 271 GEAR FINISHING MACHINE Filed April 15, 1946 1s Sheets-Sheet s WALTER S. PRAEG ATTOR N EYS Feb. 12, 1952 w. s. PRAEG GEAR FINISHING MACHINE Filed April 15, 1946 18 Sheets-Sheet 9 INVENTOR.

WALTER S. PRAEG ATTORNEYS 1952 w. s. PRAEG GEAR FINISHING MACHINE l8 Sheets-Sheet 10 Filed April 15, 1946 FIGJG.

INVENTOR. WALTER S. PRAEG ATTORNEYS Feb. 12, 1952 w, s, PRAEG 2,585,271

GEAR FINISHING MACHINE Filed April 15, 1946 18 Sheets-Sheet l1 INVENTOR.

WALTER SPRAEG ATTORNEYS 12, 1 52 w. s. PRAEG 2,585,271

GEAR FINISHING MACHINE Filed April 15, 1946 18 Sheets-Sheet 12 26 3o FIG.3I.

INVENTOR.

WALTER S. PRA EG ATTORNEYS 1952 w. s. PRAEG 2,535,271

GEAR FINISHING MACHINE Filed April 15, 1946 18 Sheets-Sheet 14 INVENTOR.

WALTER SPRAEG ATTORNEYS Feb. 12, 1952 w s PRAEG 2,585,271

GEAR FINISHING MACHINE Filed April 15, 1946 18 Sheets-Sheet l5 INVENTOR.

WALTER S. PRAEG ATTO R N EYS Feb. 12, 1952 w. s. PRAEG GEAR FINISHING MACHINE Filed April 15, 1946 18 Sheets-Sheet l6 WALTER s. PRAEG FIG.29.

ATTORNEYS Feb. 12, 1952 Filed April 15, 1946 W. S. PRAEG GEAR FINISHING MACHINE l8 Sheets-Sheet l7 58 51 q 64 5 60 as I IN V EN TOR.

WALTER $.PRAEG ATTORNEYS Feb. 12, 1952 w 5 PRAEG 2,585,271

GEAR FINISHING MACHINE Filed April 15, 1946 l8 Sheets-Sheet 18 ATTORNEYS iatented Feb. 12, 1952 GEAR FINISHING MACHINE Walter S. Praeg, Detroit, Mich., assignor to National Breach & Machine Company, Detroit,

Mich., a corporation of Michigan Application April 15, 1946, Serial No. 662,280

15 Claims. (01. 901.6)

The invention relates to gear finishin machines and refers more particularly to machines for finishing the faces of the teeth of semi-finished or roughed-out gears. I

The invention has for one of its objects to provide an improved machine which is constructed to economically finish gears.

The invention has for another object to pro vide an improved machine in which the finishing tool is engageable with a work gear and performs the finishing operation while an operator replaces a finished work gear by asemi-finished or roughed-out work gear. v

The invention has for still another object to provide an improved machine comprising a plurality of finishing tools each of which is engage able with a Work gear and performs the finishing operation on its work gear while an operator replaces the finished work gears by semi-finished or roughed-out work gears.

The invention has for a further object to provide an improved machine comprising a turret for carrying the work gears, a member carrying the work gear finishing tool, index mechanism for indexing the turret to position a work gear for engagement by the tool, and mechanism for relatively moving the slide and turret toward and away from each other to engage the work gear and tool or disengage the same.

The invention has for further objects to provide means for accurately locating the semi-finished or roughed-out work gear in a predetermined angular position to accurately locate a space between adjacent teeth of the work gear with respect to the tool, to provide means for accurately locating the finishing tool to accurately engage a work gear; to provide an improved co'nstruction of reciprocable main slide and finishing tool head assembly for driving the finishing tool and also moving the finishing tool to traverse the work gear; and to provide an improved construction in which the finishing tool while traversing the work gear has the motion imparted to it to effect crowning of the teeth of the work gear.

The invention has for still further objects'lto provide means for stopping the operation of the machine in the event that the work gears are not properly secured in place in their work gear holding fixtures or the finishing tool and work gear with which the finishing tool is engageable are not properly angularly positioned to accurately mesh.

These and other objects of the-invention will become apparent from the following description taken in connection with the accompanying. drawings in which: 2 i V Figure 1 is a plan view of the gear finishing machine embodying the invention;

' cutter head assembly;

Figures 5 and 6 are end views of the main slide;

Figure 7 is an end view of the cutter head assembly;

Figures 8 and 8A are complementary cross sections on the line 8-8 of Figure 3;

Figure 9 is a cross section'on the line 9- 9 of Figure 3;

Figure 9A is a cross section on the line 9A-9A of Figure 9;

Figure 10 is a cross section on line l0l0 of Figure 4;

Figure 11 is across section on the line I l-I I of Figure 8A; 7

Figure 12 is an extended cross section on line l2-l2 of Figure 5;

Figure 13 is a cross section illustrating an extra gear forming part of the gearing of Figure 12;

Figure 14 is a cross section on the line i i-Id of Figure 1 illustrating the cam mechanism for reciprocating the main slide;

Figures 15 and 16 are cross sections on the lines l5-I5 and l6l6 respectively of Figure 14;

Figures 17' and 18 are views similar to Figure 16 illustrating the operation of the cam mechamsm;

of Figure 7; I

Figure 20 is an elevation of a portion of Fig ure 7 Figure 21 is a cross section on the line 2|-2l of Figure 4;

Figure 22 is a top plan view of the cutter head with the cap removed illustrating the mechanism for indexing the cutter;

Figure 23 is an end elevation thereof;

Figure 24 is a cross section on the line 24-24 of Figure 11;

Figure 25 is across section taken the line 25-25 of Figure 1;

Figure 25A is an enlarged view of a Figure 25; V

Figure. 26 is a cross section on the line 26-46 of Figure 25;

Figure 27 is an enlarged elevation of the lower work gear holding fixture of Figure 25 Figure 28 is a cross section on the line 28--28 of Figure 2; i

generally on portion of Figure 29 is an enlarged elevation partly in section of the upper work gear holding fixture of Figure 25;

Figure 19 is a cross section on the line l9-l Figure 36 is a top plan of the mechanism of Figure 34;

Figure 37 is a cross section on line 31-31 of Figure 36; Figure 38 is a cross section on line 38-38 of Figure 35.

While the gear finishing machine may be of the single or multiple cutter type, it is as illusslidably engages and is longitudinally movable within the housing 22. 3| is a collar threaded on the upper end of the tubular member 26 and forming an abutment engageable with the upper end of the slide 30 so that upon upward movement of the slide it contacts the collar and through the collar raises the tubular member and with it the spindle and work gear holding member.

To move the upper work holding member 25 toward the lowerwork gear holding member 2|,

trated in Figures 1 to 38 inclusive, of the multiple-cutter type and comprises the base I, the turret overhead support 2, the vertical turret 3, between the base and support, and the pair of main slides 4 and 5 horizontally slidable on ways on the base toward and away from the turret and carrying the cutters 6 wh ch are engageable with the semi-finished Work gears 1 which are carried by the turret. In the present instance the 'main slides are reciprocable at anan'gle of 90 to each other.

The turret 3, as best seen in Figure 25, consists of the tubular member Bend the stub shaft 3 which is suitably secured to the upper end of the tubular membe'rf and. is preferably piloted therewithin. The tubular {memberhas the cylindrical lower end ln'fwhich is journ'aled in the bearing carrier secured to the base The tubular member @150 has 'the's'ubstantially square body l2 above the bearing carrier and made with faces at substantially right angles to each other, each face being provided with the pair of longitudinally extending T-shape'd slots I3.

l4 and I5 are cooperating work gear holding fixtures keyed to each face of the turret by the keys l6 (Figure 28) engaging the slots I3 and secured to each face of the turret by suitable means such as the bolts I1. The fixtures are longitudinally adjustable of the turretand, as shown, are

arranged on the turret with their axes 90 apart.

As a result the turret has four equally spaced stationsA, B, C, and D, the stations A and B being used as the work gear finishing stations, and the stations 0 and D being used as the work gear loading stations for the work gear finishing stations A and B respectivley, the work gear loading stations being diametrically opposite their respective work gear finishing stations.

Each fixture l4, (Figures 2'1 and 28) commonly known as a head stock, comprises the housing |8,

the sleeve |9 having a tight fit within the housing I8, the spindle 20 journaled in the sleeve and the lower work gear holding member 2| which is mounted in an enlarged end of the spindle and which, as shown, is a center.

Each fixture I5, (Figures 29 to 33 inclusive) commonly known as a tail stock, comprises the housing 22, the sleeve 23 longitudinally slidable within the housing 22, the spindle 24 journaled in and longitudinally movable with the sleeve 23 and the upper work gear holding member 25 which is mounted in-an enlarged end of the spindle and which, as shown, is a center. The sleeve 23 has threaded to its upper end the tubular member 2 5 which encircles and preferably clears the reduced stem of the spindle 24. The tubular member has at its lower end the enlargement 21 which forms an abutment for the concentric in ner and outer coil springs 28 and 29V respectively, the upper ends of which abut the slide 30. which the slide 30 has preferably formed integrally therewith the longitudinally extending rack 32 and this rack is engaged by the gear segment 33 which is secured to the shaft 34 journaled in the housing 22. 35 is a manually operable handle secured to the shaft 36 outside the housing 22, the shaft being journaled in the housing. The handle upon being swung in one direction by the operator effects resilient downward movement of the upper work gear holding member 25 toward the lower gear holding member 2| to exert a predetermined pressure upon the work gear 1.

For the purpose of locking the upper work gear holding member 25in its adjusted holding position independently of the coil springs 28 and 29 means are provided to engage the sleeve 24 and hold it in its adjusted position. This means comprises the pin 31 which is slidable in the housing 22 transversely of and into engagement with the sleeve 24 after it has been advanced to advance the work gear holding member to its holding position. The pin 31 has the tapered face 38 engageable with a corresponding face 39 on the sleeve 24, these faces being inclined toward the axis of the spindle in a direction opposite to that taken by the spindle in being moved to its holding position.

40 is a multi-armed lever having the arm 4| pivotally mounted in the housing 22 by the pin 42, the second arm 43 for moving the pin 31 toward and away from the sleeve 23 and the third arm 44 for swinging the lever in a direction to move the pin 31 toward the sleeve 24. The arm 43 is preferably formed with the rounded surface 45 engageable with the shoulder 46 on the pin 31 to urge the latter toward the sleeve 23. The arm 43 is also connected to the pin 31 by the pin 41 to effect retraction of the pin 31 by means of the coil spring 48 which abuts the housing 22 and extends into and abuts the arm 43. The arm '4| is engageable with the housing 22 to limit swinging of the multi-armed lever 40 when retracting the pin 31 under action of the spring 48. 49 is a cam secured to the shaft 35 and engageable with the arm 44 to effect swinging of the multi-armed lever 40 to produce the locking action upon the spindle when in its work gear holding position.

50 is a link pivotally connected to the cranks 5| and 52 secured respectively to the shafts 34 and 36 and serving upon rotation of the shaft 36 by the handle 35 to rotate the shaft 34 and thereby advance the upper work gear holding member 25 to holding position through the intermediate mechanism including the gear segment 33, the slide 38 and the spindle 24. The pivots for connecting the link 50 to the cranks 5| and 52 are so located that when the gear segment has been swung forwardly a distance sulficient to firmly engage the upper work gear holding member 25 with the work gear and firmly hold the work gear against the lower work gear holding member 2|, the line connecting the pivots has passed over or beyond the axis of the shaft 

